buildroot upstream patch 2021-06-15
64ead5b pointed to by patch:
[Buildroot] [PATCH 3/4] configs/beaglev: update u-boot to enable OF_SEPARATE
BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,starfive-tech,u-boot,64ead5b83959da8eb87b6963843addf5942e6ed4)/uboot-64ead5b83959da8eb87b6963843addf5942e6ed4.tar.gz"